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a A d (No Model.) E BOETTCHER. i 2 Sheets-Sheet 1.

ELECTRIC LAMP. No. 303,614. Patented Aug. 19, 1884.

(No Model.) 2 Sheets-Sheet 2.

' E. BOETTGHBR.

ELECTRIC LAMP.

No. 303,614. Patented Aug. 19, 1884.

Unirse STATns PATENT Trice..

EMIL BOETTCHER, OF LEIPSIC, GERMANY.

ELECTRIC LAMP.

.SPECIFICATION forming part of Letters Patent NoA 303,614, dated August 19, 1884. Application filed September 52S), 1883. (No model.)

To @ZZ whom it may concern:

Be it known that I, EMIL Bon'rrcnnn, a citizen of Germany, and resident of Leipsic, in Germany, have invented a new and useful Improvement in Electric Lamps, of which the following is a specification.

This invention relates to electric lamps of the arc-light kind, and it consists, partly, in certain devices, hereinafter particularly described and claimed, for regulating the feeding of the carbon points to one another.

In the accompanying drawings, Figure I represents a standing` electric lamp,partly in section, with the carbon points removed. Fig. II shows a top view of the same; Fig. III, a horizontal section at line Z Z, Fig. I. Fig. IV is a side view of the saine without the lower stand. Fig. V is avertical section of the same. Fig. VI is a front view, and Fig. VII a side view of a suspended electric lamp surrounded by a glass globe. y

Similar letters represent similar parts in all the -figures.

The lower-carbon carrier A, isolated through a suitable non-conducting material from its casing B, the latter being surroundedby helix T, which is in the circuit and makes said casing a tubular electro-magnet, is provided with arms C C, connected through cords D D, passing over guiding-pulleys E E,and the under side of small pulleys F F, and partly around the surfaces of said pulleys F F with these pulleys. These pulleys F F are attached to a shaft, G, supported in suitable center points, c c, for the purpose of reducing friction. In the center of this shaft G a large pulley, II, is fixed, to which a metal chain, J, is attached,passing partly around thispulley, and the other end of which is attached to the holder K of the upper carbon point.

M is a light frame attached to the lower casing, B, which supports the pulleys E E, the center points, e a, and shaft G,with their pulleys,as well as the split tubing L, in whichthe holder II. is guided, and capable of moving with the least possible amount of friction.

N is the stand for the lamp.

In Figs. VI and VII a suitable strap, I), is attached to the upper part of the frame M,fro1n which the lamp is suspended, and suitable hooks, R, are attached to the lower casing, B,

rcarbon holder.

to support the glass globe S. The coil T, surrounding the lower case, B, is connected through the chain U with one of the arms C.

The positive electric current is communr vcated to the shaft Gr and through the same, the

wheel I-I,and metal chain J to the upper charcoal point, while the negative electric current is communicated to one of the arms C, and at the same time connected with the coil T, is

thus communicated to the lower charcoal point. On account of the excess ofthe weight of the upper carbon point, together with the weight of part of the chain J, this upper carbon point will descend, moving at the same time the lower carbon point, with its holder A and cross-arms C C upward until the two carbon points touch or are brought in contact. Theadmission of the electric current separates the points of the charcoal to produce the electric light, which may be regulated according to the desired intensity of the current by increasing or diminishing the weight ofthe lower- The loss of weight resulting from the quicker consumption of the upper carbon point will be equalized by the greater amount of metal chain J unwound from the wheel II. At the same time will the diminishing magnetic strength of the coil T, resulting from the gradual withdrawal of the lower-carbon holder A, in consequence of the consumption of the lower carbon point,be equalizedby the raising of a clrai1i,V,Fig. I, (or any suitable spring,) attached to one of the cross-arms C,the other end or body of which rests in a suitable plate on the frame M. It will be apparent that as the body of the chain XV rests in a suitable plate on the frame M, that part of said chain. lifted from said plate, or the length between this plate and the arm G,will act upon the arm C, and add as much weight to the lower-carbon carrier A, to retain thereby at all times nearly the relative equilibriumbetween the lower and upper-carbon carrier, which otherwise changes on account of the faster consumption of the upper carbon point. The advantages of this arrangement are, first, its very simple; construction; second,the facility with which every part of the mechanism is made accessible; third, the great reduction of weight of the mechanism and lamp; fourth, the cheapness o f the whole construction, and', fifth, the great IOO facility wherebyv the whole urrangennL-nt and l mechanism een he regulated.

\\7linl{l rlz1i1n is inyinvenl'ien, and desire le secure hy LeiternI llnient, is*

l. A tubular electreenaignel, in eeinhinntien with :t lowerenrl on holder which has vertical motion therein, i vertically-i'novnhle uppercnrhen helder, intervening devices whereby the descent el' the upper-carbon helder causes the ascent elf the lewerlezu'lilen helder7 und ehziins which ;res1)ertively Innke electric eenneelien between the eoilv of the tubular electron'lngnet mul the leverenrhen helder,zi1nl he- Lween the immer-emilion helder -amd il, xeil pnrt of the Vl'rznne,thn`scompleting the eirenitwhi le :illewin g the motion elsni d helrlersgis Sel l'erth.

2. The combination el" the lower enrhen helder A, crees-:irme C (l, eerlls l) l), pulleys fll lll nml F F, Shaft GF pulley ll, :rnd elnrn (l,

'with the nnper-eznfhen helrlerlli, Substnntinlly in [he znniner :ind l'er the I nirposc (leserheil.

J3. The eexnlwinntien el' n chain, W', with the .lmveremfhen helder A, snhsl'nntinlly :is le- Scrillell, wherebyl'he grzulnil rellnetien el the electremmgnetie nttrzietiijm el he cell ll is 25 equzllizml, as set forth. 

